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Rifles, Reloading, Optics, Equipment
Reloading
7mm RUM reloading difficulties
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<blockquote data-quote="Mysticplayer" data-source="post: 83220" data-attributes="member: 8947"><p>If the case length and neck diameter check out, try measuring the base on the case in front of the extractor groove and at the shoulder. Believe it or not, FL sizing dies don't always size enough. The RUM is a high pressure rd and brass can grow very quickly. If the dies don't bump the shoulder enough or squeeze the base, it doesn't go in.</p><p></p><p>The fact that some brass does and others don't leads me to believe it's a die issue. Sometimes taking just a bit of the bottom of the die is enough to bump the shoulder and make the brass chamber.</p><p></p><p>Nothing wrong, just a stacking of tolerances.</p><p></p><p>However, having a OAL with that much variance and not crash into the lands is not a good thing. With a throat that long, accuracy is not likely to be in the tiny arena.</p><p></p><p></p><p>Jerry</p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 83220, member: 8947"] If the case length and neck diameter check out, try measuring the base on the case in front of the extractor groove and at the shoulder. Believe it or not, FL sizing dies don't always size enough. The RUM is a high pressure rd and brass can grow very quickly. If the dies don't bump the shoulder enough or squeeze the base, it doesn't go in. The fact that some brass does and others don't leads me to believe it's a die issue. Sometimes taking just a bit of the bottom of the die is enough to bump the shoulder and make the brass chamber. Nothing wrong, just a stacking of tolerances. However, having a OAL with that much variance and not crash into the lands is not a good thing. With a throat that long, accuracy is not likely to be in the tiny arena. Jerry [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
7mm RUM reloading difficulties
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